Boiler



' July 2, 1940.

A. P. GRIMM 2,206,398

' BOILER Filed July 1, 1938 5 Sheets-Sheet 1 a v 4% Py ATTORNEF July 2, 1940.

A. P. GRIMM 2,206,398

BOILER Filed July 1, 1938 5 Sheets-Sheet 2 V INVE T i/zr/ P INVENTOR- A. P. GRIMM Jul 5 2, 1940.

BOILER Filed July 1, 1938 5 Sheets-Sheet 5 July 2, 1940.

A. P. GRIMM BOILER 5 Sheets-Sheet 4 Filed July 1, 1938 .I'IIII'II INVENTOR /7!r 627/5/27 A. P. GRIMM July 2, 1940.

BOILER Filed July 1, 1938 5 Sheets-Sheet 5 INVENTOR /2 //.r/7. %hh1/71 ATTORN Patented July 2, 1940 UNITED STATES PATENT oFF cs 2,206,398 I BOILER. Albert Preston Grimm, Raritan, N. J. i v

Application July 1, 1938, Serial No. 217,905

7 Claims.

My invention relates to boilers, more particularly to boilers of the sectional type especially adapted for oil firing, and has for its object the production of a boiler that is more efli'cient than those now commonly used.

One of the objects of the invention is to produce a boiler that will approach perfect combustion and hold the heat within the boiler and provide a good heat transference structure so that the heat generated will be transferred to the water for the production of steam without unnec-.

essary loss.

A further object is to provide a structure that will have a low flue temperature and a high combustion temperature.

A further object is to provide a structure in which the burner is assembled on the combustion chamber ring prior to mounting the ring on the boiler.

The foregoing and other features of my invention will now be described in connection with the accompanying drawings forming part of this specification in which I have represented my boiler in its preferred form after which I shall point out in the claims those features which I believe to be new and of my own invention.

In the drawings:

Figure 1 is a perspective view of my boiler as viewed from the front or burner end.

Figure 2 is a perspective View of my boiler as viewed from the back or flue end, i. e., opposite I to that shown in Fig. 1.

Figure 3 is a front view of a front section of the boiler.

Figure 4 is a vertical section along the line 44, Fig. 3.

Figure 5 is a horizontal section along the line 55, Fig. 3.

Figure 6 is a front view of one of my mid-sections of the boiler.

Figure '7 is a vertical section along the line l-l, Fig. 6.

Fig. 8 is a horizontal section along the line ll8, Fig. 6.

Figure 9 is a front view of a rear section positioned along the line 99, Figure 2.

Figure 10 is a vertical section along the line Ill-Ill, Figure 9.

Figure 11 is a horizontal section along the line ll-ll, Figure 9.

Figure 12 is a horizontal section along the line l2-l2, Figure 9.

Figure 13 is an enlarged vertical section of the combustion chamber showingone type of burner assembled on th front plate of the boiler.

Figure 14 is a section along the line 14-44, Figure 13 showing the outlets for the hot gases upon entering the tortuous path through the boiler to the flue.

Figure 15 is an enlarged detail of the cover in front of the boiler, and burner mounting plate.

In the carrying out'of my invention, Ifind it desirable to construct my boiler in a plurality of sections, comprising a front section 40, a rear I section 60 and one or more mid-sections 80. {10} These sections have machine ground surfaces to ensure perfect assembly and prevent short-circuiting of the hot gases and infiltration of the outside air. They are assembledas shown in Figures 1 and 2 and held together by bolts 20.

In the installation illustrated the burner is located behind the ventilating cover 2!, the suction blower 22 pulls the hot gases through the boiler and sends them up the flue 23.

Easily removable panels 24 provide ready access to fines for cleaning the carbon, while a special peep-hole 25 is provided for observation of the burner operation without opening the door.

It will be observed that the combustion chamber is located above the middle of the sections directly under the steam dome of the section and that the carefully proportioned flue passages are provided so that the gas travels five times the length of the boiler with each traverse being lower than that of the former. With this construction the hottest gas is directly under the steam dome.

The design of the front section is illustrated in detail by Figures '3, 4 and 5. This section 4!) is a typical hollow sectional, shape having passages M for the hot gases and hollow section 42 for the water with a larger section 43 at the top as a steam dome in which the steam is made to be used for heating purposes.

The central opening 45 is located above the mid-center of the section and is formed approximately one-half inch in diameter larger than the combustion chamber which is inserted there in. It will be observed that with this design the hottest combustion temperature is directly under the steam dome 43. After the combustion is complete the hot gases are drawn through the boiler structure by the suction blower 22. These passages are provided with a plurality of heat extrudcrs 46 so spaced and shaped to give a maximum of heat transference, to convey the generated heat of the hot .gases through the metal of the section to the circulating water.

The design of the mid-section is illustrated in detail in Figures 6, 7 and 8. In Figures 1 and 2 I show three of these mid-sections 80. I may use only one of these sections or I may use a greater number, depending on the capacity required. The middle section likewise is a hollow sectional structure having passages 8| for the hot gases, designed so that when in assembled relation with the front and. rear section the hot gases upon leaving the combustion chamber pass through the entire length of the boiler five times with each traverse lower than the former. In tracing out this passage of the hot gas, after the combustion is complete, the hot gas passes through the section in central passage 82 to the rear, then forward through 83 then rearward through 84, then forward through 85, then back again through 86 to the flue 23.

These passages are also provided with heat extruders 8'! to perfect the heat transference and baffles 88 to keep the gases in a swirling motion in its first passage through the boiler. The water is circulated in the section in passages 89 with a steam dome on the upper part of the section. Here again it must be observed that the steam dome is directly over the combustion chamber.

The design of the rear section is illustrated in detail in Figures 9, 10, 11 and 12. The design of this hollow section 60 is such that when the hot gases leave the combustion chamber they strike 1 up against the wall GI provided with a plurality of heat .extruders 02 adapted to transfer a maximum of heat units to the water in the hollow 64. The flue passages are also provided with heat extruders 66. It will be observed that these projections on all the passages completely cover all of the vertical surfaces and the upper horizontal surface, and that they are omitted on the lower surface to aid in cleaning the fines. It has been found out that it is impractical to have these projecting points on the lower surfaces because of difficulties presented when the carbon is being removed during cleaning operation.

This section may be machine ground on the raised portion 10 so that it will tightly fit the ground raised portion 90 of a mid-section 80 and the latter when fitted to the raised portion of a front section 0.0 so that there will be no infiltration of cold air into the boiler or the bypassing of the hot gases in their proper passages through the boiler.

In Figure 13 I show an enlarged detail of my combustion chamber I00 which is cylindrical in shape and may be built up of a plurality of sections. The front section I0! is made of two semi-cylindrical portions formed of high temperature material and when placed together provide a central opening I 02 through which the burner extends, and a frustro conical surface I03 extending from the opening I02 to the cylindrical portion I04.

The mid-section is also made up in semi-cylindrical pieces I I0. I may use two or more of these with this construction. I may make my combustion chamber any desired length as will be readily understood.

The rear section H5 is a fiat partition provided with a plurality of openings Hi5 and III. It will be observed that these holes are alternately disposed, every other one around the circle is round and the alternate holes are out of round.

Experience has demonstrated that with this arrangement the life of the rear wall H5 is much longer because the material is the heaviest where 3 the heat is the hottest and therefore not so liable to burn out, and therefore does give a longer life.

With my invention I provide for convenience of assembly of the burner to the boiler a ring I30. This ring is bolted to the furnace by the bolts I3I and is provided with a flange I32 to which the burner assembly I50 is attached.

The burner assembly I50 is bolted to the ring I83 while it is not attached to the boiler. The

space between the burner assembly and the ring is then packed with asbestos rope I55.

The entire ring is then packed with high temperature cement I50 and allowed to harden be-' fore the ring I03 is mounted to the furnace. With this construction the burner assembly is packed to the furnace ring prior to final assembly.

As the packing is inserted from within, there is no possible chance of it being blown out in service.

A draft regulator is provided in the cover of the burner. It will be observed that the cover 2! is provided with two sets of holes; one set lIiI above the horizontal diameter and the other set I52 below the horizontal. The lower set has a closing door I63 mounted to swing on hinge I64. This door is of light material and opens with the start of the vacuum within the combustion chamber caused by the suction of the blower 22 when the burner starts to operate. On the door I provide a cup IE6 for holding a plurality of shot so that the weight may be adjustable to suit the requirements of service. The upper set of openings IEI provide sufficient air for ordinary purposes but when a heavy load is on the burner, the suction blower opens the lower set of holes I52 providing free passage for the proper amount of additional air.

It is not necessary to go into detail in reference to the burner I80 which is of the atomizing type electrically ignited by the spark plugs I8I. The oil is delivered through the supply line I82 by a pump (not shown) which may be driven by the blower motor.

As a safeguard against blowing up of the boiler, should anything go wrong in the ignition or gas supply and an unusual explosion occurs within, I provide a relief door 2I0 located within the structural part of the boiler in the gas passage in front of the blower and stack.

.It will be observed that I have presented two new departures in sectional boiler design. The first is a cylindrical combustion chamber entirely enclosed, and second, its location is directly under the steam dome so that the hottest part of the flue gases in their path through the boiler is where the steam is made. With this construction we have in a normal operation of the boiler a relatively higher combustion temperature with a lower flue gas temperature.

My boiler may be supplied with the usual safeguards and I provide the necessary outlets for the purpose. 2H] is the water gauge. 2 and 2I2 are provided for water level inspection should the water gauge become broken for any reason and is out of commission. 2I3 is the low water out out plug. 2I5 is provided for the acquastat. 2I6 is the plug for the stack switch.

I wish it distinctly understood that my boiler herein illustrated and described is in the form in which I desire to construct it and that changes or variations may be made as desirable or convenient without departing from the salient features ofmy invention and I therefore intend the following claims to cover such modifications as naturally fall Within the lines of invention,

I claim:

1. In a sectional boiler, comprising a plurality of hollow water circulating sections, a cylindrical combustion chamber having a perforated rear wall located within a space in the assembled sections above the central portion thereof, an enclosed gas expansion chamber adjacent the rear wall of the combustion chamber, a path for the hot gases passing through the assembled sections a plurality of times leading from the gas expansion chamber to exit, each passage for gas being lower than its. immediate predecessor in its passage to the exit.

2'. The device of claim 1 in which the cylindrical combustion chamber is provided with a central opening in a frustro conical front surface, and a cylindrical mid-section.

3. The device of claim 1 in which the perforations of the perforated rear section of the cylindrical combustion chamber are alternately round and substantially elliptical openings.

4. In a sectional boiler comprising a plurality of hollow water sections, a combustion chamber located in the upper half of the boiler, a path for the hot gases passing a plurality of times through the assembled sections, each passage for gas being lower than the immediate predecessor, said passages being supplied with heat extruders on the vertical and upper surface of the passage, and smooth on the lower surface whereby the heat units of the flue gases are transferred to the water in the Water sections.

5. The device of claim 4 with the addition the combustion chamber being cylindrical and provided'with a single circular opening in a frustro conical front surface and a rear surface comprising a perforated flat plate.

6. In a steam boiler, having a Waterheacl, a circulating passage and a flue, a cylindrical combustion chamber located directly under the water head and having a central opening in a frusto conical front surface and a perforated rear surface in front of and leading to the circulating passage conveying the hot gases downward to the flue.

'7. The device of claim 6 in which the perforations of the rear section are alternately round and substantially elliptical passages.

ALBERT PRESTON GRIMM. 

